I stayed in Ao Nang this winter. Railey/Tonsai is a peninsula without any land access, so I ended up taking the longtail boats back and forth each day. 100 baht for round trip tickets, and I honestly enjoyed getting to ride on the boats past the coastline and getting to know the boat guys.
The positives of staying at Ao Nang were: cheaper accommodations for higher quality lodging (more like paying 15-20 USD a night for a nice hotel room with AC, a kitchen, etc…), the food is about 50% cheaper in Ao Nang, and there are a ton of restaurants, bars, and European tourists to hang out with. The other surprise was Ao Nang Wall North on the mainland which is a newer sector with really great climbing.
The negative side is that you do have to “commute” back and forth each day which leaves early morning starts and late evening/night returns as near impossible unless you charter a boat (600 baht), the climbing community mostly stays at Tonsai like Jacob mentioned and I would hear stories about the hangouts in the evenings on the beach (I lined up partners from MP beforehand so had the partner-end covered but could see that being harder if you weren’t at the hangouts).
I was blown away by Thailand’s climbing! Definitely worth a trip at least once!